The seals data set from the ggplot2 R package consists of
## lat long delta_long delta_lat ## Min. :29.7 Min. :-172.8 Min. :-2.0671 Min. :-0.45794 ## 1st Qu.:34.7 1st Qu.:-159.8 1st Qu.:-0.8222 1st Qu.: 0.01162 ## Median :39.7 Median :-145.8 Median :-0.5818 Median : 0.12571 ## Mean :39.7 Mean :-145.8 Mean :-0.5633 Mean : 0.14145 ## 3rd Qu.:44.7 3rd Qu.:-131.8 3rd Qu.:-0.3168 3rd Qu.: 0.24642 ## Max. :49.7 Max. :-118.8 Max. : 0.2578 Max. : 0.76436
It represents the vector field of seal movements in the Pacific Ocean.
- The long and lat variables represent the x and y coordinates of a grid where the measurements are taken.
- The delta_long and delta_lat variables represent the x and y components of the displacement vector.